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N78Sensibly equivalent¶ to:
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The N78 is a 1953 audio output pentode with a high mutual conductance, suggesting that full output can be obtained with a low input signal. In use this B7G audio output valve ran very hot.In class AB1 push pull a pair of valves can deliver 9 Watts at 4.5% distortion. If connected as triodes the pair can deliver 6.3 Watts at 1.6% distortion.M-OV produced these valves and branded them with paper labels: GEC for professional sales and commercially, Emitron, Marconi and Osram.![](../pics/abn0160a.jpg)
The GEC label.The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 60 mm tall.References: Data-sheet & 1040. Type N78 was first introduced in 1952. See also 1952 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | ![](../static/key.gif) g1 | k,g3 | h | h | a | ic | g2 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | Pout | D | ![](../static/pdflogo.gif)
| 6.3 | 0.64 | 250 | 250 | -5.5 | 36 | 5 | 40,000 | 10 | 4W | 10% |
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Updated April 29, 2018.
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